Effects of different abdominal compression plate positions on accuracy in stereotactic body radiotherapy for liver cancer(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2023年第9期
- Page:
- 1064-1068
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Effects of different abdominal compression plate positions on accuracy in stereotactic body radiotherapy for liver cancer
- Author(s):
- SHAO Jianhui; YANG Xin; LI Yaning
- State Key Laboratory of Oncology in South China/Collaborative Innovation Center for Cancer Medicine/Department of Radiation Oncology of Sun Yat-Sen University Cancer Center, Guangzhou 510060, China
- Keywords:
- Keywords: liver cancer stereotactic body radiotherapy abdominal compression plate position respiratory movement setup error
- PACS:
- R816.5
- DOI:
- -
- Abstract:
- Abstract: Objective To investigate the effects of different abdominal compression plate positions on setup error and tumor mobility in stereotactic body radiotherapy (SBRT) for liver cancer. Methods Thirty patients pathologically diagnosed with liver cancer were enrolled and divided into abdominal compression group (n=15) and xiphoid process group (n=15) according to their abdominal compression plate positions. A total of 180 groups of 4D-CBCT scanning data were obtained from the 30 patients. The setup errors in each group were recorded and analyzed, and the tumor mobility was analyzed by XVI (X-ray volumetric imaging system) of Elekta linear accelerator. Results The xiphoid process group had smaller setup error in Y direction than abdominal compression group (P<0.05). For tumor mobility in 3 directions, the mean tumor mobility in only Y direction, mean square error of tumor mobility in only Z direction, and maximum tumor mobility in both X and Y directions were all lower in xiphoid process group than abdominal compression group (P<0.05), and the other differences between two groups were trivial (P>0.05). The target margins of xiphoid process group were smaller than those of abdominal pressure group in all 3 directions. Conclusion In liver cancer SBRT, the abdominal compression plate under xiphoid process has more obvious respiratory depression than under abdominal navel, which greatly reduces setup error and tumor mobility, and improves the accuracy in radiotherapy.
Last Update: 2023-09-26